采集专用php基于CURL的HTTP类库php HTTP类库

<?php
/**
 * 封装基于curl的HTTP类库
 *
 * @file    class_httplib.php
 * @author	qaulau@hotmail.coma
 * @date    2013-8-1
 */
class httplib{
	private $response;
	private $response_header;
	private $response_data;
	private $response_info;
	private $response_httpcode;
	private $timeout = 30;
	private $cookie = '';
	private $useragent = 'PHP-HttpLib-v1.0';
	private $request_header = array();
	private $starttime;
	private $request_proxy = array();
	private $request_method;
	public function __construct(){
		$this->starttime = self::_microtime();
		//能有效提高POST大于1M数据时的请求速度
		$this->set_header('Expect');
	}
	/**
	 * 设置cookie(可选)
	 * @param <array|string> $cookie
	 */
	public function set_cookie($cookie = ''){
		if (is_array($cookie)){
			$cookies = array();
			foreach ($cookie as $k => $v){
				$cookies[] = $k.'='.$v;
			}
			$this->cookie .= implode('; ', $cookies);
		}else{
			$this->cookie .= $cookie;
		}
	}
	/**
	 * 设置用户浏览器信息(可选)
	 * @param string $useragent : 浏览器代理信息
	 */
	public function set_useragent($useragent = ''){
		$this->useragent = $useragent;
	}
	/**
	 * 设置头部伪造IP(可选)，对某些依靠头部信息判断ip的网站有效
	 * @param string $ip ： 需要伪造的ip
	 */
	public function set_forgeip($ip){
		$this->set_header('CLIENT-IP',$ip);
		$this->set_header('X-FORWARDED-FOR',$ip);
	}
	/**
	 * 添加请求头部信息
	 * @param string $k
	 * @param string $v
	 */
	public function set_header($k,$v = ''){
		if (!empty($k)){
			$this->request_header[] = $k.':'.$v;
		}
	}
	/**
	 * 设置超时时间(可选)
	 * @param int $sec
	 */
	public function set_timeout($sec){
		if($sec > ini_get('max_execution_time')) @set_time_limit($sec);
		$this->timeout = $sec;
	}
	/**
	 * 设置代理(可选)，如对方限制了ip访问或需要隐藏真实ip
	 * @param string $host	：代理服务器（ip或者域名）
	 * @param int	 $port	：代理服务端口
	 * @param string $user	：用户名（如果有）
	 * @param string $pass	：用户密码（如果有）
	 */
	public function set_proxy($host,$port = '',$user = '',$pass = ''){
		$this->reque